Lag is more similar to the phrase "days ago". Essentially, it allows you to specify the particular value of a measure from a period of time in the past. The "date offset" phrase takes your entire filter and runs it on a particular date specified in the past. In "date offset", every element in your screen is essentially shifted back to that date. So, if you had a "days ago" phrase in a filter and then used "date offset", the "days ago" phrase would be further shifted.

Hopefully this makes some sense. If not, please don't hesitate to let us know!

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